LSF filter

The Metso Outotec LSF filter is used to remove and recover solids in low concentrations from process liquids. The quality of the resulting filtrate increases production capacity while boosting the quality of plant and refinery products.

Metso Outotec LSF filters exploit the phenomena of adsorption filtration to cause micronic and sub-micronic particles to adhere to the fibers of the filter, despite being small enough to pass through its pores. This activity reduces particle concentration in the filtrate to almost undetectable levels. Filter aids such as precoat and body feeds are unnecessary in the vast majority of applications, but if required, the filter can be operated with a filter aid without needing modification.

With filtration areas available up to 720 m², process flow sheets can be simplified by installing a reduced number of filters. Our LSF filters are manufactured in materials that are resistant to highly corrosive solutions and high process temperatures.

During filtration, the process liquid is fed to the vessel and liquid passes through the cloth at a low velocity, leaving the particles on the fabric and only allowing clear filtrate to pass through. Pumping at constant flux, the initial pressure is low and this slowly increases as a cake builds on the elements.

All models feature a unique, fully programmable cloth cleaning and cake discharge system. The cake solids settle in the conical bottom with multiple filtration cycles for each wet cake discharge. Once the vessel pressure reaches the maximum, a discharge and cloth washing sequence is initiated to remove the accumulated solids and clean the cloth before refilling and resuming the next filtration sequence. 

A SERIES FILTERS

Metso Outotec A series filters are available as vertical vessels in five different sizes with a filtration area of 15 m² to 300 m². The A series produces higher cake solids concentrations (% w/w) than the C, D, and E series polishing filters.

D SERIES, SINGLE FLANGED

Metso Outotec single-flanged D series filters range from 80 m² to 180 m² in filtration area. The horizontal cylindrical configuration offers easy maintenance access at floor level. The fixed head unit enables a permanent connection to process pipework and has an easy-to-roll, retracting shell covering.

DD SERIES, DOUBLE FLANGED

Metso Outotec double-flanged DD series filters range from 80 m² to 360 m² in filtration area. The familiar horizontal cylindrical configuration features a double-flanged fixed head unit for optional expansion, as well as easily retractable shell coverings.

E SERIES, DOUBLE FLANGED

The double-flanged E series includes very large polishing filters that can handle flows of up to 800 m³/h when configured to operate with a filter aid, and as high as 576 m³/h in a standard adsorption configuration. The fixed head unit is double flanged for optional expansion and features easily retractable shell coverings.